sanguinololu: i think something burned out?!

I had to repair a crimp connector on my heatbed and when i connected everything and turned on the heatbed to print i realized that i had connected the things wrong! The smoke i saw coming from the board helped me to realize that....

Result: now when i turn the heat on to 60º for example it just keeps on going on and on...it just ignores the temperature i set, but it gives me the reading of the temperature on printrun like always.

I´m guessing i need to replace something on the sanguinololu (1.3a) . My guess would be the mosfet, but since i don´t see nothing burned i would like to ask if that its probably the component to replace and/or if there is some way to check if it is ok?

Cheers

Perhaps you could check the gate voltage/control pin voltage when you hit your set temp. If it's turning off at the ATmega but not at the FET then you have a bad FET. If it's not turning off at the ATmega you might have a burnt out pin. In what way were your connections wrong? Most HBP are not polar so connecting it backwards should have no effect. Was it shorted out completely?

Bryan

I added two photos to show the way i connected it wrong. I only connected three pins instead of the four of them.

Looking at it closer the middle pin of the Mosfet has a little black spot.

When you say FET is it a short for Mosfet? How do i check the gate voltage/control pin? I guess i have to use the multimeter, my question is on what points?

Sorry for all the questions..

**also i just plugged my new panelolu2 and it does not show any info about a heatbed on the LCD. Don´t know if this info helps..

Paulo

Edited 1 time(s). Last edit at 08/17/2013 02:52PM by pdesigns.

scratch that part about the Panelolu. It was a error on the firmware. Now it indicates the temperature.